org.neo4j.cypher.internal.expressions.GraphPatternQuantifier.scala Maven / Gradle / Ivy
/*
* Copyright (c) "Neo4j"
* Neo4j Sweden AB [https://neo4j.com]
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.neo4j.cypher.internal.expressions
import org.neo4j.cypher.internal.util.ASTNode
import org.neo4j.cypher.internal.util.InputPosition
sealed trait GraphPatternQuantifier extends ASTNode with HasMappableExpressions[GraphPatternQuantifier] {
def canBeEmpty: Boolean
}
case class PlusQuantifier()(val position: InputPosition) extends GraphPatternQuantifier {
override def canBeEmpty: Boolean = false
override def mapExpressions(f: Expression => Expression): GraphPatternQuantifier = this
}
case class StarQuantifier()(val position: InputPosition) extends GraphPatternQuantifier {
override def canBeEmpty: Boolean = true
override def mapExpressions(f: Expression => Expression): GraphPatternQuantifier = this
}
/**
* Represents a quantifier like {1, 5} with optional lower and upper bound.
*/
case class IntervalQuantifier(lower: Option[UnsignedIntegerLiteral], upper: Option[UnsignedIntegerLiteral])(
val position: InputPosition
) extends GraphPatternQuantifier {
override def canBeEmpty: Boolean = lower.map(_.value.longValue()).getOrElse(0L) == 0
override def mapExpressions(f: Expression => Expression): GraphPatternQuantifier = copy(
lower.map(f).asInstanceOf[Option[UnsignedIntegerLiteral]],
upper.map(f).asInstanceOf[Option[UnsignedIntegerLiteral]]
)(this.position)
}
/**
* Represents a quantifier like {3} with for which lower and upper bound are equal.
*/
case class FixedQuantifier(value: UnsignedIntegerLiteral)(val position: InputPosition) extends GraphPatternQuantifier {
override def canBeEmpty: Boolean = value.value == 0
override def mapExpressions(f: Expression => Expression): GraphPatternQuantifier =
copy(f(value).asInstanceOf[UnsignedIntegerLiteral])(this.position)
}